“The amount of victims -- the amount of people, who, to this day, have no idea that they are a victim, is significant," said Jim Hudson, a detective with the Placer County Sheriff’s Office. "And unfortunately, I am the one who has to go and find them and tell them they are victim."

Deputies seized two computers at Nelson’s Rocklin home as part of the investigation on April 15.

A forensic evaluation of the computers found Nelson had hidden cameras in his home, and filmed women showering and using the bathroom, deputies said.

“There is no doubt, based on the locations that they are hidden in, the cameras were camouflaged in something else in these restrooms or (portable toilets)," Hudson said.

Investigators are trying to identify the women in the videos, which date back to 2007.

They already have found more then two dozen victims, but say that number might triple.